The effectiveness of far-infrared irradiation on foot skin surface temperature and heart rate variability in healthy adults over 50 years of age: A randomized study.

Medicine (Baltimore) · 2020 · PMC7738146 · PMID 33327260

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an increasing trendno p-value reported

Lin et al [ 20 ] observed that FIR therapy induced significant HRV responses with an increasing trend of LF and LHR in healthy subjects.

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